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This portal provides access to maps, data, and other information on the distribution and frequency of natural hazards in the United States. The material is arranged into seven categories: earthquakes, floods, hurricanes...

This site is the homepage of the National Oceanic and Atmospheric Administration's (NOAA) tsunami warning center for Alaska and the west coast of the United States. Users can access current tsunami information through...

This report describes the results of a major United States Geological Survey (USGS) geologic and oceanographic study of the Gulf of the Farallones, adjacent to the San Francisco Bay region. The first of its kind, the...

This article provides a brief introduction to the processes of weathering and erosion in desert environments. Topics include the differences in the way these processes proceed in wet and arid environments, the role of...

This collection of historic topographic maps goes back to the late 19th century. Comparison of maps of the same area from different times allows users to observe changes in land use over time. The maps can be searched...